def test_contradiction(self):
dimacs = """\
p cnf 3 1
0
"""
opb = """\
* #variable= 3 #constraint= 1
*
>= 1;
"""
F = CNF()
F.add_greater_or_equal(["a", "b", "c"], 4)
F = Expand(F)
self.assertCnfEqualsDimacs(F, dimacs)
self.assertCnfEqualsOPB(F, opb)
def test_contradiction(self) :
dimacs="""\
p cnf 3 1
0
"""
opb="""\
* #variable= 3 #constraint= 1
*
>= 1;
"""
F=CNF()
F.add_greater_or_equal(["a","b","c"],4)
F = Expand(F)
self.assertCnfEqualsDimacs(F,dimacs)
self.assertCnfEqualsOPB(F,opb)
def test_one_inequality(self):
dimacs = """\
p cnf 3 3
1 2 0
1 3 0
2 3 0
"""
opb = """\
* #variable= 3 #constraint= 3
*
+1 x1 +1 x2 >= 1;
+1 x1 +1 x3 >= 1;
+1 x2 +1 x3 >= 1;
"""
F = CNF()
F.add_greater_or_equal(["a", "b", "c"], 2)
F = Expand(F)
self.assertCnfEqualsDimacs(F, dimacs)
self.assertCnfEqualsOPB(F, opb)
def test_one_inequality(self) :
dimacs="""\
p cnf 3 3
1 2 0
1 3 0
2 3 0
"""
opb="""\
* #variable= 3 #constraint= 3
*
+1 x1 +1 x2 >= 1;
+1 x1 +1 x3 >= 1;
+1 x2 +1 x3 >= 1;
"""
F=CNF()
F.add_greater_or_equal(["a","b","c"],2)
F = Expand(F)
self.assertCnfEqualsDimacs(F,dimacs)
self.assertCnfEqualsOPB(F,opb)
